【ZT英文】F-35 现代化计划的成本，进度不断增长：政府问责局

https://breakingdefense.com/2022/04/f-35-modernization-programs-costs-schedule-keeps-growing-gao/#:~:text=The%20Block%204%20modernization%20program,in%202018%2C%20continues%20to%20snowball.

“两大因素推动成本上涨”